Recovered the ParVagues loop naming scheme empirically from 1690 existing loops,
rather than inventing one: NN_<role>[_<character>]. The corpus EDA that grounds it
(reproducible via `naming.analyze_corpus`, parsers-over-copy): 46% carry a 2-digit
NN_ index (the hand-cut-kit signature, vs keyed/tempo packs like 120g/80c), 74%
underscore-joined, only 16% repeat the kit name (the folder already carries it), and
the role tokens cluster on voice/vocals, keys, guitar, bass, brass, synth.

naming.py provides:
- suggest_name(index, role, character=, section=) → NN_role[_section][_character],
  slugged + zero-padded + de-duped against names already taken in the kit.
- stem_of(role) → maps a role/character word back to its stem family, so a name
  stays honest to what was actually separated (never infer role FROM the name —
  the finder knows the stem; the name reflects it).
- lint(name) → flags drift (no index, spaces, uppercase, odd chars).
- analyze_corpus() → re-derives the stats above from the live Samples tree.

Wired as export_take's default namer (replaces the inline f"{i:02d}_{name}"), so the
GUI Forge button and CLI export both land convention-compliant names; the GUI's
per-stem name field still overrides. CLI: python3 -m engine.naming --suggest 3 synth dark
| --lint <name> | --analyze. 6 tests; full foundry suite green.